Bcrypt Generator

What is Bcrypt Generator?

Generate a bcrypt hash from any text with a chosen number of salt rounds, or verify that a piece of text matches an existing bcrypt hash. It uses bcryptjs, a pure-JavaScript implementation of the same algorithm your server's bcrypt library uses.

How to Use the Bcrypt Generator

1. 1

   Enter the Text to Hash: Type the password or text you want hashed.

2. 2

   Choose Salt Rounds: Pick a cost factor (8, 10, 12, or 14); higher is slower but more resistant to brute-forcing.

3. 3

   Generate the Hash: Click Generate hash to produce a fresh bcrypt hash.

4. 4

   Verify a Hash (Optional): Enter plain text and an existing hash, then click Verify to check whether they match.

What Is Bcrypt?

Bcrypt is a password-hashing algorithm. It turns a plain-text password into a fixed-length hash that's stored instead of the original password. It is deliberately one-way: there's no "decrypt" operation that turns a bcrypt hash back into the password that produced it. Checking a login attempt means hashing the entered password the same way and comparing the two hashes, not reversing the stored one. Each bcrypt hash also embeds a random salt, generated fresh per hash. That's why hashing the same password twice produces two different (but both valid) hashes, and why two users with the same password end up with completely different stored hashes.

Why Bcrypt for Password Storage

A fast general-purpose hash like MD5 or SHA-256 is a poor fit for passwords specifically: it's built for speed, which means an attacker with a list of leaked hashes can try billions of guesses per second on ordinary hardware. Bcrypt is intentionally slow, with that slowness controlled by its salt-round (cost factor) setting; each increment roughly doubles the work required per hash. That tunable slowness is the whole point: it makes checking one real login fast enough to be unnoticeable, while making a brute-force sweep over millions of guessed passwords impractically slow.